SLC1: High-affinity glutamate and neutral amino acid transporter

 SLC2: Facilitative GLUT transporter

 SLC3: Heavy subunits of the heteromeric amino acid transporters

 SLC4: Bicarbonate transporter

 SLC5: Sodium glucose cotransporter

 SLC6: Sodium- and chloride-dependent neurotransmitter transporter

 SLC7: Cationic amino acid transporter/glycoprotein-associated

 SLC8: Na+/Ca2+ exchanger

 SLC9: Na+/H+ exchanger

 SLC10: Sodium bile salt cotransporter

 SLC11: Proton-coupled metal ion transporter

 SLC12: Electroneutral cation-coupled Cl cotransporter

 SLC13: Human Na+-sulfate/carboxylate cotransporter

 SLC14: Urea transporter

 SLC15: Proton oligopeptide cotransporter

 SLC16: Monocarboxylate transporter

 SLC17: Vesicular glutamate transporter

 SLC18: Vesicular amine transporter

 SLC19: Folate/thiamine transporter

 SLC20: Type III Na+-phosphate cotransporter

 SLC21/ASLCO: Organic anion transporter

 SLC22: Organic cation/anion/zwitterion transporter

 SLC23: Na+-dependent ascorbic acid transporter

 SLC24: Na+/(Ca2+-K+) exchanger

 SLC25: Mitochondrial carrier

 SLC26: Multifunctional anion exchanger

 SLC27: Fatty acid transporter

 SLC28: Na+-coupled nucleoside transporter

 SLC29: Facilitative nucleoside transporter

 SLC30: Zinc efflux transporter

 SLC31: Copper transporter

 SLC32: Vesicular inhibitory amino acid transporter

 SLC33: Acetyl-CoA transporter

 SLC34: Type II Na+-phosphate cotransporter

 SLC35: Nucleoside-sugar transporter

 SLC36: Proton-coupled amino acid transporter

 SLC37: Sugar-phosphate/phosphate exchanger

 SLC38: System A and System N sodium-coupled neutral amino acid transporter

 SLC39: Metal ion transporter

 SLC40: Basolateral iron transporter

 SLC41: MgtE-like magnesium transporter

 SLC42: Rh ammonium transporter

 SLC43: Na+-independent, system-L-like amino acid transporter

 SLC44: Choline-like transporter

 SLC45: Putative sugar transporter

 SLC46: Folate transporter family

 SLC47: Multidrug and Toxin Extrusion (MATE) family

 SLC48: Heme transporter family

 SLC49: Transporters of the major facilitator superfamily

 SLC50: Sugar efflux transporter

 SLC51: Transporters of steroid-derived molecules